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Abstract Recent observations have indicated surprisingly high oil recoveries for gravity drainage. This has prompted us to reexamine gravity drainage as an oil recovery process. It is shown that oil relative permeability is a key factor. For accurate measurement of this oil relative permeability, we have developed a new method based on centrifugal gas/oil displacement in small cores. Several oil relative permeabilities for various rock types are presented. These relative permeabilities confirm that gravity drainage in water-wet, connate-water-bearing reservoirs can be very effective for oil-recovery.
Jacques Hagoort (1980) studied this question.